need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明,
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![need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明,](/uploads/image/z/11829229-61-9.jpg?t=need+have+done+%2Cmust+have+done+%2Ccan%2Fcould+have+done+%2Cshould+have+done+%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%3F%E6%84%8F%E6%80%9D%E6%98%AF%E4%BB%80%E4%B9%88%3F%E4%B8%BB%E8%A6%81%E7%94%A8%E4%BA%8E%E5%93%AA%E7%A7%8D%E5%8F%A5%E5%9E%8B%3F%E8%AF%B7%E5%88%86%E5%88%AB%E4%B8%BE%E4%BE%8B%E8%AF%B4%E6%98%8E%2C)
need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明,
need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明,
need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明,
need have done .本人才疏学浅,没见过这种说法,通常是need to be done,表示需要被完成.如:All the housework needs to be done today.(今天需要完成所有家务.)
must have done肯定猜测语气,表示一定已经完成了.如:He must have finished the housework.(他肯定已经完成家务了.)
could have done 表示本可能已经完成某件事,常表示结果与事实相反.can have done 不常见.如:He could have finished the housework if he didn't watch the basketball games.(如果他不看篮球赛,本应该已完成家务了.)
should have done,应该已经完成某事,这个“应该”不是指推测,而是指理论上的,或义务上的.如:According to the cookbook,the cake should have been baked well now.(根据菜谱,蛋糕应该已经被烤好了.)